1 Answer
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Normally -oac and -ovc are for special audio and video codecs. In this case the commands says it just should (stream)copy them. The option -o gives the name of the output file.

The output could be forced to FLV, but this is currently buggy, and you will get the following message if you try adding -of lavf:

REMEMBER: MEncoder's libavformat muxing is presently broken and can generate
INCORRECT files in the presence of B-frames. Moreover, due to bugs MPlayer
will play these INCORRECT files as if nothing were wrong!

thanks! I get Audio format 0x4134504d is incompatible with '-oac copy', please try '-oac pcm' instead or use '-fafmttag' to override it. which option should I use?
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d3vidJan 18 '13 at 13:36

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I used -oac pcm and it worked. This forced the output to be an AVI instead of FLV, which doesn't bother me, but the combined file is 3 times the size of the originals. Any suggestions?
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d3vidJan 18 '13 at 14:13

You might recode the audio part as I describe in an update to my answer.
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qbiJan 18 '13 at 14:23

1

avi is preferred because the flv encoder is buggy; I used -oac mp3lame based on betterlogic.com/roger/2011/05/… and it worked, I now have an AVI only slightly larger than the originals
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d3vidJan 21 '13 at 8:51